lorvey Loc: Lincoln, Nebraska

Are there any DPP experts out there? I have a couple questions about saving and converting and image using DPP. After editing a RAW file, I save the image in TIFF or JPG format. The DPP pop-up save screen has a field to change the resolution on the saved photo. The default resolution value is 350. As an experiment, I changed the resolution to 700 and saved an image. I compared a 350 resolution image with a 700 resolution image and can see no difference between the two. Even after blowing up the images 400%, I can see no difference. Do any of you adjust this resolution value when you save an image, and can you see a difference in the saved photos?

Question #2. The DPP Save function also allows you to resize a photo and adjust the height and width pixel count. Do any of you have any experience with this feature? Does DPP do resampling if the image is enlarged. Is the resulting image suitable for printing an enlargement? Just wondering is this feature is worth using, or whether resizing should be reserved for Photoshop or ON1 software.

Appreciate all comments. Thank you.

CHG_CANON Loc: the Windy City

Save to a 16-bit TIFF if you plan to take the output from DPP and edit further in other software, such as PhotoShop. The DPI value has not impact on the image, when viewed, whether you specify 1 to infinity. Just leave it at the DPP default and ignore.

Resizing is relevant to the intended use of the image. This post will help explain "good" sizes for images shared specifically online. If you plan to print or want to retain that option without resaving the image from within DPP, leave at the original pixel dimensions. https://www.uglyhedgehog.com/t-512745-1.html

lorvey Loc: Lincoln, Nebraska

Thank you CHG_CANON for your response and reference to an exhaustive analysis of the issue of resizing and saving images. When I save using DPP, I will leave the resolution value at the default value (350).

I am still interested in knowing from users of DPP if they ever "resize" an image when they create an output file from DPP. Does the process do resampling and what is the quality of the output? The reason i would like clarification on this is because it seems like it would make more sense to resize from the RAW file, but maybe enlarging from the TIFF file using Photoshop or ON1 software is just as good. Canon does not address this in their documentation, and I find nothing in any forums addressing this issue.

CHG_CANON Loc: the Windy City

I don't understand the concern. My 5DIII produces images 5760x3840-pixels for the RAW files. Same when converted to TIFF. Other cameras produce other sizes, some examples were provided in the earlier link. Take those dimensions and divide each side by 300- down to 200-pixels and you have the first round of physical print sizes at 300 PPI (pixels per inch). For this example: 19x12 at 300, 23x15 at 250, 28x19 at 200. You can round to typical whole inch values like 30x20 inches.

The pixels in the image determine the physical print size at a given pixels per inch value. No matter the software, "adding" pixels into an image is detrimental to the printed result, the more added, the more detriment.

Have you performed the simple experiment of opening a CR2 file in DPP and performing a conversion to TIF and / or JPEG and asked the software to increase the pixel dimensions beyond the size of the original RAW file? If you view the results, say 8000px on the long side, against the original at 100%, the differences are relatively easy to see.

Again, what is the issue? Do you want to print larger than 30x20 for an image that doesn't have the pixels for that print size prior to resizing actions? The Canon software is "commercial", but certainly not market leading against specialized software where market-leading S/W would be expected to perform better in some / many actions, such as resizing to enlarge an image.

lorvey Loc: Lincoln, Nebraska

Yes, there are times, not frequent, that I would like to print larger than 30X20 and the image does not have the required pixels. Prior to yesterday, I had never noticed the capability in DPP to resize a photo. So the reason for the post was to find out if anyone ever used that function in DPP and if it provided good print quality. That's all. I can use Photoshop or On1 Resize for that purpose.

And based on your comments, I probably should not be upsizing or using the resample function anyhow considering the image quality will probably suffer. That's good to know. And no, I have not experimented with increasing the image size in DPP beyond the original file size. I need to do that. The results will probably answer my question. Thank you for your input.

John N Loc: HP14 3QF Stokenchurch, UK

The resizing tool is a doddle to use. Some of my images (those that go around the family or a local community FACEBOOK page) need to be resized in order to get the best out of FACEBOOK.

Just tick the resize box, and put a dimension in and the other will change automatically. Last time I checked the best resolution for FACEBOOK was 2048 lines on the longest dimension - whether that be height or width.